The song, "Mama's Boy" (also referred to as "Mama's Boyfriend") will sound familiar if you remember Kanye's a cappella performance at the Facebook offices (video below) during the MBDTF rollout period. That song, a (probably fake) version of which leaked online, didn't made it to the final album in any form.

"With 'Ye, we do so many different versions of things," Q-Tip told the audience. "He did another version [of this song] with Soulja Boy, too... We had this one that we were really going to probably do...but it didn't wind up [on the album]. But I wanted you guys to hear one of the things that I did for him. It's kind of cool."

Watch Q-Tip's entire lecture below. The Kanye West stuff starts at about one hour and 36 minutes in.